Sydno[3,4-a][1,3]thiazolo[2,3-c]quinoxalin-6-one was synthesized from readi
ly available sydno[3,4-a]quinoxalin-4-thione. In an attempted synthesis of
sydnonyl- 1,2,4-thiadiazol-3-one, an unexpected dimer bissydno[3,4-a]quinox
alin-4-yl disulfide was obtained.